2016 RAM 2500 - Stock ECM File

I just got my MM3 today and installed it into the truck.

The previous owner tuned the truck, so I thought it'd be best to return the stock ECM file before loading on the new custom files.

The SD card not having the stock file on it already, the flash failed, and I keep getting an error 14106.

I am not able to cancel the stock flash to try and install the custom files.

Do I need the stock file added to the sd card to fully flash back to stock, then continue the custom file upload?

Any help would be greatly appreciated as the truck has currently locked itself without having any ECM files loaded and won't start.

Who's tuning do you have?

Thank you,
igotacummins

Installing a new tune will overwrite whatever tune is currently loaded no need to return to stock first.